Crank-case main bearing.



C. B. KIRKHMWI CRANK CASE MAIN BEARING.

APPLICATION FILED FEB. 7. I916.

Patented Nov. 5, 1918.,

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u lltl, T BUFlEAilLtl, NEW TUBE, SIG-1T0, BY lllillllBlllE dfiSIGrldhlllENTfi, ATJBUJPLE AND MGTUB CUBJPUBATION, OT BB'TJEALU, NEW 'ltt'llltK, 4th

CRANK-EASE lllldfl l' BEARING.

naaeoa;

To all whom ttmag concern:

Be it known that r, calms n. Kurd ing is a specification.

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v which-is especially designed to secure great d ll The present invention relates to. a motor accessory and is particularly concerned in the provision of a crank shaft bearing cap strength with comparative lightness, in order to render its use advantageous in power plants adapted for such high speed service as is expected of an aeronautical motor.

Usually the crank casing is ribbed from wall to wall transversely and bearing portions are provided inthe various rib ings and in longitudinal alinement for the re ception of the crank bends of the motors driving shaft, while caps formed with mating bearing portions are secured to the ribbings after the crank shaft has been placed in position. ft is to such bearing caps my,

present invention relates.

its a principal object l contemplate the provision of a bearing cap having a semicylindrical bearing portion which is ribbed both transversely and longitudinally by webs flanged out into substantial l-sections..'

The lower hang of these webs is arranged to form a suspended truss and continues lat-- erally to reinforce wing portions which areformed transversely. upon the central hearing portion. A key seat is provided in one of these win s for the reception of a key or crank case ribbin to which the cap is secured, bolts or similar suitable fastening means being employed for the latter purbll.

from the central bearing portion and by constructing other adjoining flanges after the mer of a eiin le truss have succeeded in evolving a reinforcement for the cap specification or. Letters Patent.

. Application tiled li'ebruary r, rein aerial an. eerie.

, flangin feather whic is adapted to be directly init terposed between the bearing cap and the.

Patented ltov, d, rain.-

of which like characters of reference designate similar parts, 4

Figure l is a transverse,'sectional view taken through the crank casing of a motor which is equipped with the bearingcap co1nprehended by this invention; 7

Fig. 2" is a longitudinal section taken through one of thev crank shaft bends as mounted in the bearing completed by addition of the cap;

Fig. 3 is a view in per re, and

Pi l is a detail sectional the llne of Fig. l.

The crank casing, as a whole, of any internal combustion motor is usually built up from upper and lower portions which are designated in Fig. l by respective numerals l0 and ll. These portions are laterally flanged as indicated at 12 for securement to each other. The u per portion 10 of the crankcase is providiad with transverse ribbi'ng 13, which in the present instance has been illustrated as being double walled and as extending downwardly Bush with the 12. Between the double walls of ing 13 are formed the integral perspective of the cap view taken on the rib blocks ll of varying height andadaptw as will be later shown, to receive the fasten.

ing bolts which secure the bearing cap to the under edge of the ribs 13;

lit will be un erstood that the spacing of the ribs 13 longitudinally of the upper portion of thecrank case is to be determined by the spacin between crank bends T5 of the power shah denoted as a whole by the numeral 16. Eachofthese ribs is accordingly formed with an arcuate bearing portion 17 which is lined with a suitable antifriction metal 18 adapted to have direct contact with the appropriate crank 15. The walls of each rib 13 are thickened out in the The bearing portion 17 of each crank case rib is, of course, but semicylindrical, which accordingly necessitates the employment of the complementary bearing portion which is provided by the cap 22.

- By referring to Fig. 3 in particular, the

. construction of the cap 22 will be apparent.

The bearing portion 23 thereof has the same dimensions as that of the rib bearing 17 andis fitted with the sleeve 18 of anti-friction metal previously mentioned. Extending laterally from the bearing portion 23 are opposite wing portions 24, one of which is provided with a key seat 25 paralleling the axis of the bearing. Radiating from the under surface of the bearing portion 23 are a number of webs 26 which form a longitudinal reinforcement of the cap which is completed by the transverse annular webbing 27 intersecting therewith. A truss flanging denoted as a whole by the numeral 28 is cast integrally with the webs 26 and 27, being in the form of an inverted arch whose extremities merge into the lateral wing portions 24. Each of the webs 26 accordingly becomes an I-section, whose opposite flanges are provided for by the truss flanging 28 at one extremity and by the bearing portion 23 at the other. It will be immediately apparent from an inspection of Fig. 2 that the transverse webbing 27 also partakes of a true I-section form.

Connecting each wing 24 with the flange 28 suspended therefrom are a plurality of lugs 29 which are bored for the reception of bolts 30, the latter entering into the seats provided therefor by the block portions 14 arranged between the double walls of the rib 13 to which the bearing cap is to be attached. A key or feather 31 is inserted within its seat 25 in the bearing cap, and in a similar seat arranged within the rib 13, being symmetrically interposed between two portions which 'make up the complete crank shaft bearing. This key receives such thrust as might be imposed upon the bearing cap out a of alinement with the crank shaft 16.

From the foregoing it should be apparent that the objects previously presented have been attained by means of the construction covered in the description just concluded.

It will be also clear that changes necessary to adapt my bearin cap to motors having slightly different iaracteristics in such manner as may be predicated upon the true spirit of the invention, which may be said to include those essential characteristics which are Iparticularly pointed out in the appended c aims may be made.

What is claimed is:

1. A crankshaft bearing cap of the type set forth including a bearing portion, and intersecting ribbin strengthenin the bearing portion and orming I-seetions therewith.

2. A crankshaft bearing cap of the type set forth including a bearing portion and ribs strengthening the bearing portion and forming longitudinal and transverse I-scctions therewith.

3. A crankshaft bearing cap of the type set forth including a bearing portion and ribs strengthening the bearing portion and radiating therefrom to form I-sections therewith. I a

4. A crank shaft bearing cap of the type set forth including a bearin" portion, I-section ribbing strengthening the bearing portion in one direction and ribbing radiating from the bearing portion to intersect the first said ribbing.

5. A crankshaft bearing cap of the type set forth including a bearing portion, I-section ribbing depending from the bearing portion and truss flanges connecting portions of the ribbing.

6. A crankshaft bearing cap of the type set forth, including a bearing portion, intersecting ribbing depending from thebearing portions and truss flanging formed integrally with said ribbing.

7. A crankshaft bearing cap of the type set forth including a bearing portion, truss flanging dependent from said bearing portion and lugs connecting the flanging with the bearing portion.

8. A crankshaft bearing cap of the type set forth including a bearing portion, truss flanging dependent from the bearing portion and webs radiating from the bearing portion to opposite portions of the truss.

9. A crankshaft bearing cap of the type set forth including a bearing portion, bolt lugs dependent from the bearing portion and I-section ribbing reinforcing said bearing portion and having corresponding flanges connected in truss shape and associated with said bolt lugs.

In testimony whereof I afiix my signature.

CHARLES B. KIRKHAH. 

